Wrist pin



Patented Sept. 2, 1930 CLARENCE L. SEEGERS, OF I-IAYNESVILLE, LOUISIANA WRIST PIN Application filed November 16, 1929. Serial No. 407,729.

This invention aims to provide novel means whereby a Wrist pin may be held in place, and to provide novel mea-ns whereby a member may be held on the wrist pin for movenient thereon.

It is within the province of the disclosure to Y improve generally and to enhance the utility of devices of that sort to which the present invention appertains.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes may be made in the precise embodiment of the invention herein disclosed, within the scope of what is claimed, Without departing from the spirit of the invention.

In the accompanying drawings Figure 1 shows in longitudinal section, a

device constructed in accordance with the invention, parts being broken away; and parts being in elevation.v

Figure 2 is an end elevation of the structure forming the subject matter of this application. Figure 3 is an enlargement taken approximately on the line 3-#3 of Figure 1, parts being omitted.

The device forming the subject matter of this application embodies a Wrist pin, which, as a whole, is marked by the numeral 26. The wrist pin 26 may be employed in a wide variety of Ways. In one application, the numeral 1 marks a crank having a hole 2 into which one end of the wrist pin 26 is inserted, the numeral 3 designating a pitman having an opening 4 receiving the wrist pin, the pitman having swinging movement on the wrist pin, as is common.

The foregoing details are introduced to show one way in which the wrist pin is to be used, and do not constitute a limitation on the invention.

The wrist pin 26 may include a cylindrical body 5 with an outstanding shoulder' or spacer 6, the Wrist pin 26 having a reduced end 7 which is slit longitudinally, as at 8, to form readily expansible segments 9 provided near their ends with laterally outstanding teeth 90. The end 7 of the Wrist pin 26 is inserted into the hole 2 of the crank 1, the body 5 of the wrist pin being receive-d in the opening 4- of the pitman 3, and the shoulder or spacer C being interposed between the crank 1 and the pitman 8.

The wrist pin 26 has an axial, cylindrical bore through it, from end to end. The bore comprises parts 10 and 15, the part 10 of the bore being of slightly larger diameter than the part 15. The restricted part 15 of the bore is located in that part of the wrist pin which is slit at 8 to form the expansible segments or ngers 9.

At the outer end of the body 5 of the wrist pin, there is an enlarged chamber 16 which is concentric with the part 10 of the bore in the wrist pin.

rllhe reduced end 7 of the wrist pin 26 is inserted into the hole 2 of the crank 1, and it is often necessary to drive the wrist pin into place. It is on this account that the enlai-ged chamber 16 is provided. rPhe outer end of the part 10 of the bore in the wrist pin is threaded, and by providing the enlarged chamber 16, a person can hammer on the right hand end oi the body 5 of the Wrist pin in Figure 1, Without destroying the internal threads in the part 10 of the bore of the wrist pin.

An expander 14, preferably in the form of a tapered pin, is driven into the part 15 of the bore of thewrist pin, and thereby the resilient lingers 9 are spread and the end 7 of the wrist pin is held securely in the crank 1, the teeth being made to bite into the crank 1 and aid in holding the wrist pin in place.

The pitman 3 is slid upon the body 5 of the wrist pin, into abutment with the sl1oulder or spacer 6. r1`he pitman 3 is held on the body 5 of the wrist pin for swinging movement by means of a washer 21 engaged by the head 22 of a screw 23 threaded into the outer end of the part 10 oit the bore in the wrist pin.

A securing element 20, such as a pin, is slid through an opening 24: in the washer 21 and into a seat 19 in the outer end of the body 5 of the wrist pin.

The head 22 of the securing element 0r screw 23 overlaps the pin 20, and keeps it in place. The pin 2O is a means for keeping the Washer 21 from turning. The Washer 21, in its turn, acts as a retainer, Which keeps the pitnian 3 onthe body 5 of the Wrist pin for swinging movement.

l/Vhat is claimed is l. A Wrist pin provided intermediate its ends with a shoulder, the Wrist pin being. supplied with a bore and having a reduced end, the reduced end of the Wrist pin havingv a longitudinal slit extended inwardly tothe bore and rendering the reduced end of the VWrist pin expansihle, the'slit terminating in spaced relation to the'shoulder, thereby leavingsolid portions in the Wrist pin, about the bore, on each side of the shoulder, and an eX- pander mount-ed in the bore and located in the reduced end of the Wrist pin.

2. A Wrist pin provided intermediate its ends with a shoulder, thewrist pin being supplied With a boreand having a reduced end, the reduced end of the Wrist pin having a longitudinal slit extended inwardly to the bore and rendering the reduced end of the wrist pin expansible, the slit terminating` in spaced relation to the shoulder,therehy leaving solid portionsin the Wristpiii, about the bore, on each side of the shouldeigthe here ycomprising cylindrical parts of different di-y aineters, the smallerdiametered partV oi the here being` located in the reduced end of the Wrist pin, and a smooth, tapered expander frictionally held in the snialler-diametered part of the bore. Y

In testimony that I claim the foregoing as my own, I have hereto affixed mv signature.

CLARENCE L. A SEGERS. 

